Try to refrain from double posting next time. It's kind of against the rules of MLK Forum.
Here's a better screenshot of the hyenas that are chasing Timon and Pumbaa in
1½:
Again, it does look like and it is Shenzi, Banzai, and Ed. Watching the hula scene again in the original film, it doesn't line up since it appears to at least 5 random hyenas pursuing Timon and Pumbaa, and it is implied the trio are at Pride Rock when Scar reinforces his power to Simba. Here's the screenshot of the hyenas preparing to chase them in the original sequence:
The only way to explain is to apply a suspension of disbelief, and assume the
1½ filmmakers meant for the 5 random hyenas in the original film to be nose-gassed by Pumbaa.